<!DOCTYPE html>
<html>

	<head>
		<meta charset="UTF-8">
		<title></title>
		<!--[if lt IE 9]>
    <script src="jquery-1.9.0.js"></script>
<![endif]-->
		<!--[if gte IE 9]><!-->
		<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
		<!--<![endif]-->
		<script type="text/javascript">
			$(document).ready(function() {
				$("div").focusin(function() {
					$(this).css("background-color", "#FFFFCC");
				});
				$("div").focusout(function() {
					$(this).css("background-color", "#FFFFFF");
				});
			});
		</script>
	</head>

	<body>

		<div style="border: 1px solid black;padding:10px;">
			First name: <input type="text"><br> Last name: <input type="text">
		</div>

		<p>点击输入框获取焦点，点击输入框外的部分失去焦点。</p>

	</body>

</html>